Hi @Liliana Maria Osorio ,
First I want to confirm with your fam setup. Would you like to let us know if you are using SharePoint Online or On-Premise? And is your scenario concerning Exchange Server as well?
I assume what you want is a quick overview of what policies are set in your SharePoint farm. Under normal circumstances, you can set retention policy in four places: Site Collection, Content type, Document Library, Folder. If you are checking for documents and folders within a document library, you could refer to this article for more information. If you want to check the retention policy in site collection level, maybe you need to check it manually.
If your demand is about retention policy in Exchange Server, I would suggest you go to the Exchange forum to post for more help.
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